* perf(ci): unblock parallel oxlint shards and gate the lint-lane i18n verify
check-lint is the slowest static lane (median 252s): the control-UI
i18n verify runs 86s unconditionally and the three oxlint shards run
serially (89s) because the parallel gate demands 48GB of memory — a
local-Mac threshold that Blacksmith's 32GB 16 vCPU class can never
meet. CI now parallelizes shards at 8+ cores / 24GB+, and the lint case
reuses the existing run_control_ui_i18n manifest gate so diffs that
cannot affect generated catalogs skip the verify while oxlint always
runs.
* chore(ci): print oxlint shard concurrency decision
The lint-lane validation run still executed shards serially on a 16
vCPU runner; one log line exposes the resolved concurrency and the
host resources the decision saw.
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